RT

#include<bits/stdc++.h>
using namespace std;
const int N=165;
struct fraction{int a,b;}f[N];
int cnt;
bool cmp(fraction x,fraction y){return x.a*y.b<y.a*x.b;}
int main()
{
	ios::sync_with_stdio(false);
	int n;
	cin>>n;
	for(int i=1;i<n;++i)
		for(int j=i+1;j<=n;++j)
			if(__gcd(i,j)==1)
				f[++cnt].a=i,f[cnt].b=j;
	stable_sort(f+1,f+cnt+1,cmp);
	puts("0/1");
	for(int i=1;i<=cnt;++i)
		cout<<f[i].a<<"/"<<f[i].b<<endl;
	cout<<"1/1";
	return 0;
}

输入样例#1:

1

输出样例#1:

0/1
1/1

代码输出：

0/1
1/1